Blue,
Goto google and type in "formula shell" (including the quotes) and do a UK search.
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Blue Oval
Dave the taxi driver is right. For Formula Shell the 'magic' additive was added by the delivery driver at the petrol station, probably because the petrol didn't all come from Shell refineries. Problem was they didn't always get the quantity right. The result of overdosing was that it collected on the valve stems of engines, and those with closer valve/guide clearances (predominantly Vauxhall, but others were affected) ended up with sticking and burned out valves. The Police suffered with their cars, but were able to prove it was Shell petrol as they bought petrol on contract. Some other users were not so lucky and had to pay for repairs. Not surprisingly Formula Shell was quietly dropped.
Regards
John S
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I believe that additives are still manually added at refineries, so human error may still come into it. I have no current factual evidence on this however, but perhaps someone in the know could confirm or correct?
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